Xcode 5 - 检查用户是否具有 Internet 连接 - 检测到错误的 NSStringEncoding 值 0x0000
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Xcode 5 - Check User Has Internet Connection - Incorrect NSStringEncoding Value 0x0000 detected
提问by DocAsh59
I have code to be able to detect when the user doesn't have internet that works perfectly BUT every time its triggered a message in the Debug Area appears saying:
我有代码能够检测用户何时没有完美运行的互联网，但每次在调试区域触发一条消息时都会显示：
Incorrect NSStringEncoding Value 0x0000 detected. Assuming NSASCIIStringEncoding. Will stop this compatibility mapping in the near future.
检测到错误的 NSStringEncoding 值 0x0000。假设 NSASCIIStringEncoding。将在不久的将来停止此兼容性映射。
How do I get rid of this message?
我如何摆脱这个消息？
Here is the code I'm using:
这是我正在使用的代码：
NSString *connect = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://google.co.uk"] encoding:NO error:nil];
if (connect == NULL) {
//When there isn't internet
}
else {
//When there is
}
Any help would be appreciated
任何帮助，将不胜感激
回答by Antonio MG
The method called in this line:
在这一行中调用的方法：
NSString *connect = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://google.co.uk"] encoding:NO error:nil];
Expect a encoding method for the string, not a BOOL.
期望字符串的编码方法，而不是 BOOL。
Try this:
尝试这个：
NSString *connect = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://google.co.uk"] encoding:NSUTF8StringEncoding error:nil];
回答by Amar
You are passing NO(data type BOOL) as encoding parameter which is of type NSStringEncoding.
您正在传递NO（数据类型BOOL）作为类型的编码参数NSStringEncoding。
The method signature is,
方法签名是，
+ (instancetype)stringWithContentsOfURL:(NSURL *)url usedEncoding:(NSStringEncoding *)enc error:(NSError **)error
Encoding should be one of these,
编码应该是其中之一，
enum {
NSASCIIStringEncoding = 1,
NSNEXTSTEPStringEncoding = 2,
NSJapaneseEUCStringEncoding = 3,
NSUTF8StringEncoding = 4,
NSISOLatin1StringEncoding = 5,
NSSymbolStringEncoding = 6,
NSNonLossyASCIIStringEncoding = 7,
NSShiftJISStringEncoding = 8,
NSISOLatin2StringEncoding = 9,
NSUnicodeStringEncoding = 10,
NSWindowsCP1251StringEncoding = 11,
NSWindowsCP1252StringEncoding = 12,
NSWindowsCP1253StringEncoding = 13,
NSWindowsCP1254StringEncoding = 14,
NSWindowsCP1250StringEncoding = 15,
NSISO2022JPStringEncoding = 21,
NSMacOSRomanStringEncoding = 30,
NSUTF16StringEncoding = NSUnicodeStringEncoding,
NSUTF16BigEndianStringEncoding = 0x90000100,
NSUTF16LittleEndianStringEncoding = 0x94000100,
NSUTF32StringEncoding = 0x8c000100,
NSUTF32BigEndianStringEncoding = 0x98000100,
NSUTF32LittleEndianStringEncoding = 0x9c000100,
NSProprietaryStringEncoding = 65536
};
Ex:
前任：
NSError *error = nil;
NSString *connect = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://google.co.uk"]
encoding:NSUTF8StringEncoding
error:&error];
if(error!=nil) {
//Some error occured
}
